Fig 1.
Growth trends of mussels (Mytilus galloprovincialis) from Group 1 during the maintenance period, given in terms of: A) Shell length (SL: mm) and B) Live weight (LW: g); C) mean values of shell length (hollow symbols) and condition index (CI: LW / SL3) (full symbols). Bars represent ± SE.
Fig 2.
Mean rates of daily growth along the period of study, given in both A) absolute terms (GR: mg LW day-1) and B) relative weight specific terms (SGR: % day-1). Error bars represent ±SE. For reference, an exponential function was fitted to all individual data for SGR vs time (line in B): SGR = 3.621 (±2.189) * e (-0.008 ± 0.006)* Time. Results of post-hoc test following ANOVA: Different letters denotate significant mean differences.
Fig 3.
Frequency distribution vs growth intervals.
For normality, SGR values were logarithmically transformed. Two groups of slow (S) and fast (F) growers were created with the extremes of the distribution. Insert: Growth trends of segregated groups of fast (F) and slow (S) growing mussels. Data are mean live weight (LW) values ± SE.
Fig 4.
Regression lines fitted to log-log transformed data of SMR (ml O2 h-1) vs LW (g) in 100 individuals.
Size ranges correspond to the weight increment experienced by each individual mussel. Only 5 of these regressions were not significant (P > 0.05).
Table 1.
Analysis of covariance (ANCOVA) of intra-individual SMR vs LW relationships.
Fig 5.
A) Relationship between proportionality constant (log a) and mass exponents (b) of individual allometric relationships of standard oxygen consumption and live weight. B) Mass-exponents b (±SD) and C) Proportionality constant, log a (±SD) of intra-individual allometric relationships of standard oxygen consumption and live weight plotted as a function of specific growth rate of live weight (SGRLW).
Table 2.
Inter-individual allometric relationships in different growth phases.
Fig 6.
Log-log regression lines for routine metabolic rate (RMR: Upper line; hollow symbols) and standard metabolic rate (SMR: Lower line; full symbols) vs live weight (LW).
Interindividual analysis performed on day 119 in mussels from Group 1.
Fig 7.
Regression lines for the allometric relationships of the form SMR = a*LWb for mussels from Group 2 after 2 wk.
(Intraspecific 1: upper line; hollow symbols) and 4 mo. (Intra-specific2: lower line; full symbols) maintenance in laboratory conditions.
Fig 8.
Proposed scheme accounting for a shift in the scaling exponent for the standard metabolic rate vs body size relationship, between slow growers (low maintenance demands) and fast growers (high maintenance demands).
See text for details.